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DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Aspects of the Description of Business - (Details) $ in Thousands | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2016 USD ($) | Dec. 31, 2016 USD ($) segment | Dec. 31, 2016 USD ($) MW | Dec. 31, 2016 USD ($) | Dec. 31, 2016 USD ($) item | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Oct. 26, 2016 USD ($) | Feb. 23, 2016 USD ($) | Jun. 29, 2015 USD ($) | Aug. 23, 2012 USD ($)
BASIS OF PRESENTATION |  |  |  |  |  |  |  |  |  |  |
Depreciation Expense Decrease |  |  |  |  |  | $ 2,481 |  |  |  |  |
Description of Business |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments |  | 2 |  |  | 2 |  |  |  |  |  |
Liquidity |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 10,000 | $ 10,000 | $ 10,000 | $ 10,000 | $ 10,000 | 10,000 |  |  | $ 10,000 |  |
Liquidity Requirement |  |  |  |  |  |  |  |  | $ 3,500 |  |
Principal amount | $ 5,000 | $ 5,000 | $ 5,000 | $ 5,000 | $ 5,000 | $ 5,000 |  |  |  |  |
Maximum borrowing capacity of the face value of eligible A/R (as a percent) | 85.00% | 85.00% | 85.00% | 85.00% | 85.00% | 85.00% |  |  |  |  |
Maximum percentage of book value of inventories that may be financed | 50.00% | 50.00% | 50.00% | 50.00% | 50.00% | 50.00% |  |  |  |  |
Cash and cash equivalents and short-term investments | $ 21,870 | $ 21,870 | $ 21,870 | $ 21,870 | $ 21,870 | $ 21,870 | $ 12,615 |  |  |  |
Increase (decrease) in Cash and cash equivalents and Short-term investments |  |  |  |  |  | 9,255 |  |  |  |  |
Current borrowing capacity | 17,226 | 17,226 | 17,226 | $ 17,226 | 17,226 | 17,226 |  |  |  |  |
Long-term Debt, Current Maturities |  |  |  |  |  |  | 2,799 |  |  |  |
Maximum borrowing capacity of the face value of machinery, equipment and property that may be financed |  |  |  | 50.00% |  |  |  |  |  |  |
Increase (Decrease) in Customer Deposits |  |  |  |  |  | 8,057 | (12,457) |  |  |  |
Inventories, net | 21,159 | 21,159 | 21,159 | $ 21,159 | 21,159 | 21,159 | 24,219 |  |  |  |
Increase (Decrease) in inventories |  |  |  |  |  | (3,060) | (6,925) |  |  |  |
Total debt and capital lease obligations | 4,103 | 4,103 | 4,103 | 4,103 | 4,103 | 4,103 |  |  |  |  |
Long-term Debt and Capital Lease Obligations, Repayments of Principal in Next Twelve Months | 465 | 465 | 465 | 465 | 465 | 465 |  |  |  |  |
Cash and Cash Equivalents and Short-Term Investments |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | 18,699 | 18,699 | 18,699 | 18,699 | 18,699 | 18,699 | 6,436 |  |  |  |
Short-term investments | 3,171 | 3,171 | 3,171 | 3,171 | 3,171 | 3,171 | 6,179 |  |  |  |
Interest income |  |  |  |  |  | 48 | 10 |  |  |  |
Restricted Cash |  |  |  |  |  |  |  |  |  |  |
Restricted cash | 39 | 39 | 39 | 39 | 39 | 39 | 83 |  |  |  |
Improperly Assigned Cost of Certain Component Parts |  |  |  |  |  |  |  |  |  |  |
Out-of-Period Adjustment |  |  |  |  |  |  |  |  |  |  |
Out-of-period impact |  |  |  |  |  |  | 231 |  |  |  |
Credit facility |  |  |  |  |  |  |  |  |  |  |
Liquidity |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 20,000 | 20,000 | 20,000 | 20,000 | 20,000 | 20,000 |  | $ 10,000 |  |  | $ 20,000
Period of line of credit | 3 years |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity of the face value of eligible A/R (as a percent) |  |  |  |  |  |  |  | 85.00% |  |  | 85.00%
Maximum percentage of book value of inventories that may be financed |  |  |  |  |  |  |  | 50.00% |  |  | 50.00%
Long-term Line of Credit | $ 0 | 0 | 0 | 0 | 0 | 0 |  |  |  |  |
Current borrowing capacity |  |  |  |  |  |  | $ 17,226 |  |  |  |
Outstanding indebtedness under the Credit Facility | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 |  |  |  |  |
Maximum borrowing capacity of the face value of machinery, equipment and property that may be financed |  |  |  | 50.00% |  |  |  |  |  |  |
Term Loan |  |  |  |  |  |  |  |  |  |  |
Liquidity |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  | $ 5,000 |
Towers |  |  |  |  |  |  |  |  |  |  |
Description of Business |  |  |  |  |  |  |  |  |  |  |
Number of facilities | item |  |  |  |  | 2 |  |  |  |  |  |
New Markets Tax Credit Transaction |  |  |  |  |  |  |  |  |  |  |
Principles of Consolidation and Basis of Presentation |  |  |  |  |  |  |  |  |  |  |
Number of VIE's | item |  |  |  |  | 2 |  |  |  |  |  |
Minimum | Towers |  |  |  |  |  |  |  |  |  |  |
Description of Business |  |  |  |  |  |  |  |  |  |  |
Power generating capacity of turbines that towers produced annually can support (in megawatts) | MW |  |  | 1,000 |  |  |  |  |  |  |  |
Maximum | Towers |  |  |  |  |  |  |  |  |  |  |
Description of Business |  |  |  |  |  |  |  |  |  |  |
Annual tower production capacity (in towers) | item |  |  |  |  | 500 |  |  |  |  |  |

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